[Driver] Add -### support for printing out the core command line.

llvm-svn: 169717

5 files changed, 29 insertions, 4 deletions

diff --git a/lld/include/lld/Driver/LinkerOptions.h b/lld/include/lld/Driver/LinkerOptions.h
index 801c401c176..494d403ee2c 100644
--- a/lld/include/lld/Driver/LinkerOptions.h
+++ b/lld/include/lld/Driver/LinkerOptions.h
@@ -110,13 +110,16 @@ struct LinkerOptions {
     , _target(std::move(other._target))
     , _outputPath(std::move(other._outputPath))
     , _entrySymbol(std::move(other._entrySymbol))
-    , _relocatable(other._relocatable) {}
+    , _relocatable(other._relocatable)
+    , _outputCommands(other._outputCommands) {}
 
   std::vector<LinkerInput> _input;
   std::string _target;
   std::string _outputPath;
   std::string _entrySymbol;
   unsigned _relocatable : 1;
+  /// \brief -###
+  unsigned _outputCommands : 1;
 
 private:
   LinkerOptions(const LinkerOptions&) LLVM_DELETED_FUNCTION;
diff --git a/lld/lib/Driver/CoreOptions.td b/lld/lib/Driver/CoreOptions.td
index b1c8acd40e9..97808a2053a 100644
--- a/lld/lib/Driver/CoreOptions.td
+++ b/lld/lib/Driver/CoreOptions.td
@@ -5,3 +5,5 @@ def target : Separate<["-"], "target">, HelpText<"Target triple to link for">;
 def output : Joined<["-"], "output=">;
 def entry : Joined<["-"], "entry=">;
 def relocatable : Flag<["-"], "relocatable">;
+
+def OCTOTHORPE_OCTOTHORPE_OCTOTHORPE : Flag<["-"], "###">;
diff --git a/lld/lib/Driver/Drivers.cpp b/lld/lib/Driver/Drivers.cpp
index e829ec8f972..8ff4abedebf 100644
--- a/lld/lib/Driver/Drivers.cpp
+++ b/lld/lib/Driver/Drivers.cpp
@@ -130,6 +130,11 @@ public:
     if (llvm::opt::Arg *A = _inputArgs->getLastArg(ld::OPT_relocatable))
       newArgs->AddFlagArg(A, _core.getOption(core::OPT_relocatable));
 
+    if (llvm::opt::Arg *A =
+          _inputArgs->getLastArg(ld::OPT_OCTOTHORPE_OCTOTHORPE_OCTOTHORPE))
+      newArgs->AddFlagArg(A, _core.getOption(
+                               core::OPT_OCTOTHORPE_OCTOTHORPE_OCTOTHORPE));
+
     // Copy input args.
     for (llvm::opt::arg_iterator it = _inputArgs->filtered_begin(ld::OPT_INPUT),
                                  ie = _inputArgs->filtered_end();
@@ -173,6 +178,7 @@ LinkerOptions lld::generateOptions(const llvm::opt::ArgList &args) {
   ret._outputPath = args.getLastArgValue(core::OPT_output);
   ret._entrySymbol = args.getLastArgValue(core::OPT_entry);
   ret._relocatable = args.hasArg(core::OPT_relocatable);
+  ret._outputCommands = args.hasArg(core::OPT_OCTOTHORPE_OCTOTHORPE_OCTOTHORPE);
 
   return std::move(ret);
 }
diff --git a/lld/lib/Driver/LDOptions.td b/lld/lib/Driver/LDOptions.td
index 87a50262ccc..f6c0053dfef 100644
--- a/lld/lib/Driver/LDOptions.td
+++ b/lld/lib/Driver/LDOptions.td
@@ -11,3 +11,5 @@ def output_e : Separate<["-"], "o">, Alias<output>;
 
 def relocatable : Flag<["--"], "relocatable">;
 def relocatable_r : Flag<["-"], "r">, Alias<relocatable>;
+
+def OCTOTHORPE_OCTOTHORPE_OCTOTHORPE : Flag<["-"], "###">;
diff --git a/lld/tools/lld/lld.cpp b/lld/tools/lld/lld.cpp
index c4670b77469..78b2547b5df 100644
--- a/lld/tools/lld/lld.cpp
+++ b/lld/tools/lld/lld.cpp
@@ -129,12 +129,24 @@ int main(int argc, char **argv) {
   if (!coreArgs)
     return 1;
 
-  for (auto arg : *coreArgs) {
-    llvm::outs() << arg->getAsString(*coreArgs) << " ";
+  for (const auto &arg : *coreArgs) {
+    if (arg->getOption().getKind() == llvm::opt::Option::UnknownClass) {
+      llvm::errs() << "Unknown option: " << arg->getAsString(*coreArgs) << "\n";
+    }
   }
-  llvm::outs() << "\n";
 
   LinkerOptions lo(generateOptions(*coreArgs));
+
+  if (lo._outputCommands) {
+    for (auto arg : *coreArgs) {
+      llvm::outs() << arg->getAsString(*coreArgs) << " ";
+    }
+    llvm::outs() << "\n";
+
+    // Don't do the link if we are just outputting commands.
+    return 0;
+  }
+
   LinkerInvocation invocation(lo);
   invocation();